Guard for woodworking-machines.



L. l. HALVERSTADT.

GUARD FOR WOODWORKING MACHINES.

r0 1 9 1 6 r p A d 8 t n w a P a M 0 2 Q E D D E u N 0 H A w H DI A 3 8HBETSSHEET 1.

W ym/2 M MM- WITNESSES THE NORRIS PETERS 60.. FHOTG-LITHO.. WASHINGTON, D. C.

L. 1. HALVERSTADT.

GUARD FOR WOODWORKING MACHINES.

APPLICATION FILED DEC-20, I9l3- Patented Apr. 6, 1915.

.9 1 8 a SHEET SHEET 2 INVENTOR MMQWM/ a MM 1 M M THE NORRIS PETER? CO.. PHOTO-LITHO WASHINGTUN. D. C.

L. J. HALVERSTADT. sum ron WOODWORKING MACHINES.

APPLICATION FILED PECJOI 1913. 1,1 34,733, Patented Apr. 6. 1915.

3 SHEETB-SHEET 3.

INVENTOR W WITNESSES THE NORRIS PETERS CO.. PHOTC-LITHO). WASHINGTON, D. C.

LEROY J'. HALVERSTADT, OF LEETONIA, OHIO, ASSIGNOR TO THE CRESCENT MACHINE COMPANY, OF LEETONIA, OHIO, A CORPORATION OF OHIO.

GUARD FOB, WOODWORKINGr-IVIACHINES.

Specification of Letters Patent.

' PatentedApr.6,1915.

Application filed December 20, 1913. Serial No. 807,887.

To all whom it may concern:

Be it known that I, LEROY J. HALVER- STADT, a citizen of the United States, and a resident of Leetonia, Columbiana county, Ohio, have invented a new and useful Improvement in Guards for WVoodworking- Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a plan view of a portion of the tables of a jointer having one form of my improved guard attached thereto. Fig. 2 is a side elevation of the same. Fig. 3 is an end view showing the jointer table in section. Figs. 4:, 5 and 6 are detail plan views of a portion of modified forms of spring actuating devices for the lazy tongs. F1g. 7 is a sectional view on the line VIIVII ofFig. 8 through the spring casing shown in Figs. 1 to 3, and Fig. 8 is a sectional view on the line VIII-VIII of Fig. 7.

My invention relates to an improvement in guards for wood-working machines, such as planers and j ointers, and is especially designed to provide a cheap and efficient guard which will cover the entire opening between the tables above the knife, when no work piece is being passed over the cutters.

Another object of my invention is to provide a guard which will be moved to uncover the knives when the work piece is moved onto the table of the machine which will automatically move over the cutter after the work piece has passed beyond the cutters, so as to provide a device in which the entire cutter will be covered and guarded when no work piece is on the machine, and in which all of the cutter beyond the work piece is covered when a work piece is on the machine.

A further object of my invention is to provide a device of this character which can readily be folded down along the side of the machine for large or special work or when the cutter blades are to be removed or adjusted.

The precise nature of my invention will be best understood by reference to the accompan ing drawings which will now be descri ed, it being premised, however, that various changes may be made in the details of construction and general arrangement of the parts without departing from the spirit and scope of my invention as defined in the appended claims.

Referring to the drawings, the reference character 2-2 designates the tables of a 01nter and 3 a portion of the frame work having a bearing 4: for the shaft 5 of a cutter head. Secured to the frame 3 is a bracket 6 and pivotally connected to this bracket is an arm 7. Connected to the upper end of this arm 7 is a support 8 by means of a horizontal bolt 9. Extending through a boss on this support 8 is a pivot pin 10, and pivotally mounted on this'pin 10 is a spring casing 11 and a closure or plate 12. The casing 11 is provided with. an arm 13, and the plate 12 is provided with a similar arm 14, to which are connected, the end levers of a lazy tongs arrangement 15. The ends of the levers on the other end of this lazy tongs arrangement are connected to a carriage 16, one of the levers being connected directly thereto, while the other lever is connected by means of a link 17. The casing 11 is provided with a central sleeve 18 whichis connected thereto by means of a nut 19- which engages a screw-threaded portion on the sleeve, which screw threaded portion is below a wrench seat 20 on the sleeve. Connected to the plate 12 is a pin 21, and 22 is a spiral spring, one end of which is connected to the pin 21, while the other end thereof is connected to the sleeve 18 and arranged to move the arms 13 and 14 connected to the casing and plate toward each other to extend the lazy tongs and move them toward a fence 23 which is movably mounted above the tables 2 on the jointer.

Pivotally connected to the carriage 16 is one end of a cam plate 24, and pivotally connected to the other end of this cam plate 2 1 and the support 8, is a link 25.

26 is a roller which is rotatably mounted on a pin extending in a horizontal direction from the carriage 16 and forms a support for the carriage 16.

27 is a stop screw on the arm 7 for the carrier 8, and 28 is a stop screw on the arm 7 which is arranged to engage the journal 4 and forms a stop for the arm 7 The lazy tongs forming the guard above the opening between the two tables through which the cutter blades extend, normally lies in the position shown in dotted lines in Fig. 1, when there is no work piece on the machine. When a work piece, such as shown at 29 in Fig. 1 is moved across the table it first engages the cam plate 24, as shown in dotted lines at 30 while resting against the fence 23. As the work piece is moved in the direction of the arrow, the guard will be moved away from the fence to a position indicated in full lines, and as soon as the work piece has passedvthe car riage 16, the spring 22 will move the guard to the position shown in dotted lines in Fig. 1. When it is desired to remove the guard from the jointer table, it is first raised to a vertical position about the pin 9 and is then swung about the pivotal connection between the arm 7 and the bracket 6 to the position shown in Fig. 2 and is supported on the projection extending from the frame in the machine.

In Fig. 4-, I have shown a modified form of the spring actuating mechanism in which the lazy tongs are pivoted to the support 8 by means of a pin 31, and 32 are helical springs connected to the ends of the end levers of a lazy tongs guard, and are arranged to move the ends of the levers toward each other and to extend the lazy tongs.

In Fig. 5 I have shown a plurality of helical springs 33 connected to a plurality of pivot pins of the lazy tongs levers for extending the tongs, while in Fig. 6 I have shown another form of springs 34 for eX- tending the levers of the lazy tongs guard.

The advantages of my invention result from the provision of a guard for wood working machines, which is arranged to be automatically moved over the knife after the work piece has passed beyond the guard, farther from the provision of means for moving the guard away from the fence when the work piece is moved over the table of the jointer or wood working machine.

I claim:

1. A knife guard for wood working machines, comprising a set of lazy tongs, a carriage connected to one end of the lazy tongs, a support for the other end of the lazy tongs comprising a casing having two movable members, pivotal connections between the lazy tongs and said casing members, a spring in said casing for moving the casing members to extend the lazy tongs,

and a cam plate connected to the carriage and arranged to be engaged by the work piece to move the guard over the knife; substantially as described.

2. A ointer having a frame, a work supporting table mounted on said frame, a rotary cutter below said table and extending through an opening in the table, a knife guard comprising a set of lazy tongs ranged to be moved back and forth over the opening in the table, a carriage connected to the movable end of the lazy tongs, a roller connected to said carriage and arranged to engage the top of the table, a support for the other end of the lazy tongs comprising a casing having two movable members, pivotal connections between the lazy tongs and said casing members, and a spring in said casing for moving the casing members to extend the lazy tongs; substantially as described.

In testimony whereof, I have hereunto set my hand.

LEROY J. HALVERSTADT.

Witnesses .E. V. WARREN,

FRIEDA CHELLIs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

